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Common Share Data (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]        
Total net income $ 204.4 $ 91.8 $ 449.5 $ 408.6
Average shares outstanding: Basic (in shares) [1] 244,801,566 260,796,757 244,343,845 266,341,589
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 6,273,445 4,752,898 6,112,431 4,197,019
Weighted Average Number of Shares Outstanding, Diluted, Total [1] 251,075,011 265,549,655 250,456,276 270,538,608
Net income (loss) per share: Basic (in dollars per share) $ 0.83 $ 0.35 $ 1.84 $ 1.53
Net income (loss) per share: Diluted (in dollars per share) $ 0.81 $ 0.35 $ 1.79 $ 1.51
March 1, 2024 Authorization        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Share Repurchase Program, Authorized, Amount $ 1,100.0   $ 1,100.0  
Stock based compensation awards [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive common stock equivalents excluded from earnings per share computations 1,014,202 0 1,014,202 1,317,779
[1]
(a) In calculating earnings per share, accounting standards require that common shares owned by the ORI 401(k) Savings and Profit Sharing Plan that are unallocated to participants in the plan be excluded from the calculation. Such shares are issued and outstanding, and have the same voting and other rights applicable to all other common shares.